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Generating Italic Characters in CRT Displays

Publishing Venue

IBM

Related People

Ling, GC: AUTHOR

Abstract

Fig. 1 illustrates the path of an electron beam across the face of a cathode-ray tube (CRT) screen together with the current waveforms for the main vertical deflection yoke as a function of time, and for the main horizontal yoke as a function of time. Fig. 2 illustrates the "wiggle scan" technique, in which higher frequency vertical modulations are superimposed on a normal horizontal and vertical modulations by the use of an auxiliary vertical yoke. The current waveform in the main horizontal yoke in proportion to the current waveform in the auxiliary vertical yoke are shown in Fig. 2, with the time increment shown for the main horizontal yoke being equal to one of the increments for the main horizontal yoke in Fig. 1.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
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Generating Italic Characters in CRT Displays

Fig. 1 illustrates the path of an electron beam across the face of a cathode-
ray tube (CRT) screen together with the current waveforms for the main vertical
deflection yoke as a function of time, and for the main horizontal yoke as a
function of time. Fig. 2 illustrates the "wiggle scan" technique, in which higher
frequency vertical modulations are superimposed on a normal horizontal and
vertical modulations by the use of an auxiliary vertical yoke. The current
waveform in the main horizontal yoke in proportion to the current waveform in the
auxiliary vertical yoke are shown in Fig. 2, with the time increment shown for the
main horizontal yoke being equal to one of the increments for the main horizontal
yoke in Fig. 1.

Fig. 3 illustrates video information as displayed when it is synchronized by
the main and auxiliary vertical yokes and by the main horizontal yoke driven
simultaneously, as shown by the waveform in Figs. 1 and 2. Fig. 4 shows the
result as italicized characters which is produced when an auxiliary horizontal
yoke is added and energized, as shown by the current waveforms i(v) for vertical
and i(h) for horizontal. The waveforms for the vertical auxiliary yoke and the
horizontal auxiliary yokes are shown in Fig. 4.

Fig. 5 illustrates the general case for the "wiggle scan"
method, where italicized characters with a slant Theta having an
offset Delta S(h) in the horizontal direction and a difference in
height Delta S(y) in the vertical and horizontal yokes using
waveforms i(y) and i(h), as shown. It...